There are references to the "Vedanta religion". Vedanta is not a religion; it is a philosophy derived from the Vedas.
Oona O'Neill is stated to have dated Orson Welles before she met J.D. Salinger. This is incorrect, and it is unlikely that they met more than once if they knew each other at all.
When reviewing JD Salinger's military service, the painting "The Price" by war artist Tom Lea is briefly shown. The image of the painting has been flopped from left to right.